2 sentences for 疯癫 (fēng​diān)

1. 因遭受巨大的精神打击，他从此变得疯癫了。

   yīn zāo​shòu jù​dà de jīng​shén dǎ​jī, tā cóng​cǐ biàn de fēng​diān le.

   Due to a huge mental blow, he has been insane ever since.

   Source: Dong Chinese Dictionary

2. 这群孩子在院子里疯癫地打闹，玩得满头大汗。

   zhè qún hái​zi zài yuàn​zi lǐ fēng​diān de dǎ​nào, wán de mǎn​tóu​dà​hàn.

   The group of children were frolicking wildly in the yard, playing until they were dripping with sweat.

   Source: Dong Chinese Dictionary